Commit | Line | Data |
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8fb39740 RDC |
1 | /* |
2 | * File: pn_netlink.c | |
3 | * | |
4 | * Phonet netlink interface | |
5 | * | |
6 | * Copyright (C) 2008 Nokia Corporation. | |
7 | * | |
31fdc555 RDC |
8 | * Authors: Sakari Ailus <sakari.ailus@nokia.com> |
9 | * Remi Denis-Courmont | |
8fb39740 RDC |
10 | * |
11 | * This program is free software; you can redistribute it and/or | |
12 | * modify it under the terms of the GNU General Public License | |
13 | * version 2 as published by the Free Software Foundation. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, but | |
16 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | * General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
23 | * 02110-1301 USA | |
24 | */ | |
25 | ||
26 | #include <linux/kernel.h> | |
27 | #include <linux/netlink.h> | |
28 | #include <linux/phonet.h> | |
5a0e3ad6 | 29 | #include <linux/slab.h> |
8fb39740 RDC |
30 | #include <net/sock.h> |
31 | #include <net/phonet/pn_dev.h> | |
32 | ||
f062f41d RDC |
33 | /* Device address handling */ |
34 | ||
8fb39740 | 35 | static int fill_addr(struct sk_buff *skb, struct net_device *dev, u8 addr, |
15e47304 | 36 | u32 portid, u32 seq, int event); |
8fb39740 | 37 | |
c7a1a4c8 | 38 | void phonet_address_notify(int event, struct net_device *dev, u8 addr) |
8fb39740 RDC |
39 | { |
40 | struct sk_buff *skb; | |
41 | int err = -ENOBUFS; | |
42 | ||
43 | skb = nlmsg_new(NLMSG_ALIGN(sizeof(struct ifaddrmsg)) + | |
44 | nla_total_size(1), GFP_KERNEL); | |
45 | if (skb == NULL) | |
46 | goto errout; | |
47 | err = fill_addr(skb, dev, addr, 0, 0, event); | |
48 | if (err < 0) { | |
49 | WARN_ON(err == -EMSGSIZE); | |
50 | kfree_skb(skb); | |
51 | goto errout; | |
52 | } | |
1ce85fe4 PNA |
53 | rtnl_notify(skb, dev_net(dev), 0, |
54 | RTNLGRP_PHONET_IFADDR, NULL, GFP_KERNEL); | |
55 | return; | |
8fb39740 | 56 | errout: |
4b7673a0 | 57 | rtnl_set_sk_err(dev_net(dev), RTNLGRP_PHONET_IFADDR, err); |
8fb39740 RDC |
58 | } |
59 | ||
8980713b RDC |
60 | static const struct nla_policy ifa_phonet_policy[IFA_MAX+1] = { |
61 | [IFA_LOCAL] = { .type = NLA_U8 }, | |
62 | }; | |
63 | ||
661d2967 | 64 | static int addr_doit(struct sk_buff *skb, struct nlmsghdr *nlh) |
8fb39740 | 65 | { |
8980713b RDC |
66 | struct net *net = sock_net(skb->sk); |
67 | struct nlattr *tb[IFA_MAX+1]; | |
8fb39740 | 68 | struct net_device *dev; |
8980713b | 69 | struct ifaddrmsg *ifm; |
8fb39740 RDC |
70 | int err; |
71 | u8 pnaddr; | |
72 | ||
90f62cf3 | 73 | if (!netlink_capable(skb, CAP_NET_ADMIN)) |
dfc47ef8 EB |
74 | return -EPERM; |
75 | ||
90f62cf3 | 76 | if (!netlink_capable(skb, CAP_SYS_ADMIN)) |
8fb39740 RDC |
77 | return -EPERM; |
78 | ||
79 | ASSERT_RTNL(); | |
80 | ||
8980713b RDC |
81 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_phonet_policy); |
82 | if (err < 0) | |
83 | return err; | |
8fb39740 | 84 | |
8980713b RDC |
85 | ifm = nlmsg_data(nlh); |
86 | if (tb[IFA_LOCAL] == NULL) | |
8fb39740 | 87 | return -EINVAL; |
8980713b RDC |
88 | pnaddr = nla_get_u8(tb[IFA_LOCAL]); |
89 | if (pnaddr & 3) | |
90 | /* Phonet addresses only have 6 high-order bits */ | |
8fb39740 RDC |
91 | return -EINVAL; |
92 | ||
8980713b | 93 | dev = __dev_get_by_index(net, ifm->ifa_index); |
8fb39740 RDC |
94 | if (dev == NULL) |
95 | return -ENODEV; | |
96 | ||
8980713b RDC |
97 | if (nlh->nlmsg_type == RTM_NEWADDR) |
98 | err = phonet_address_add(dev, pnaddr); | |
99 | else | |
100 | err = phonet_address_del(dev, pnaddr); | |
8fb39740 | 101 | if (!err) |
c7a1a4c8 | 102 | phonet_address_notify(nlh->nlmsg_type, dev, pnaddr); |
8fb39740 RDC |
103 | return err; |
104 | } | |
105 | ||
106 | static int fill_addr(struct sk_buff *skb, struct net_device *dev, u8 addr, | |
15e47304 | 107 | u32 portid, u32 seq, int event) |
8fb39740 RDC |
108 | { |
109 | struct ifaddrmsg *ifm; | |
110 | struct nlmsghdr *nlh; | |
8fb39740 | 111 | |
15e47304 | 112 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), 0); |
8980713b RDC |
113 | if (nlh == NULL) |
114 | return -EMSGSIZE; | |
115 | ||
116 | ifm = nlmsg_data(nlh); | |
8fb39740 RDC |
117 | ifm->ifa_family = AF_PHONET; |
118 | ifm->ifa_prefixlen = 0; | |
119 | ifm->ifa_flags = IFA_F_PERMANENT; | |
8980713b | 120 | ifm->ifa_scope = RT_SCOPE_LINK; |
8fb39740 | 121 | ifm->ifa_index = dev->ifindex; |
7f116b5b DM |
122 | if (nla_put_u8(skb, IFA_LOCAL, addr)) |
123 | goto nla_put_failure; | |
8980713b | 124 | return nlmsg_end(skb, nlh); |
8fb39740 | 125 | |
8980713b RDC |
126 | nla_put_failure: |
127 | nlmsg_cancel(skb, nlh); | |
128 | return -EMSGSIZE; | |
8fb39740 RDC |
129 | } |
130 | ||
131 | static int getaddr_dumpit(struct sk_buff *skb, struct netlink_callback *cb) | |
132 | { | |
9a3b7a42 | 133 | struct phonet_device_list *pndevs; |
8fb39740 RDC |
134 | struct phonet_device *pnd; |
135 | int dev_idx = 0, dev_start_idx = cb->args[0]; | |
136 | int addr_idx = 0, addr_start_idx = cb->args[1]; | |
137 | ||
9a3b7a42 | 138 | pndevs = phonet_device_list(sock_net(skb->sk)); |
eeb74a9d RDC |
139 | rcu_read_lock(); |
140 | list_for_each_entry_rcu(pnd, &pndevs->list, list) { | |
8fb39740 RDC |
141 | u8 addr; |
142 | ||
143 | if (dev_idx > dev_start_idx) | |
144 | addr_start_idx = 0; | |
145 | if (dev_idx++ < dev_start_idx) | |
146 | continue; | |
147 | ||
148 | addr_idx = 0; | |
a1ca14ac | 149 | for_each_set_bit(addr, pnd->addrs, 64) { |
8fb39740 RDC |
150 | if (addr_idx++ < addr_start_idx) |
151 | continue; | |
152 | ||
153 | if (fill_addr(skb, pnd->netdev, addr << 2, | |
15e47304 | 154 | NETLINK_CB(cb->skb).portid, |
998ec759 | 155 | cb->nlh->nlmsg_seq, RTM_NEWADDR) < 0) |
8fb39740 RDC |
156 | goto out; |
157 | } | |
158 | } | |
159 | ||
160 | out: | |
eeb74a9d | 161 | rcu_read_unlock(); |
8fb39740 RDC |
162 | cb->args[0] = dev_idx; |
163 | cb->args[1] = addr_idx; | |
164 | ||
165 | return skb->len; | |
166 | } | |
167 | ||
f062f41d RDC |
168 | /* Routes handling */ |
169 | ||
170 | static int fill_route(struct sk_buff *skb, struct net_device *dev, u8 dst, | |
15e47304 | 171 | u32 portid, u32 seq, int event) |
f062f41d RDC |
172 | { |
173 | struct rtmsg *rtm; | |
174 | struct nlmsghdr *nlh; | |
175 | ||
15e47304 | 176 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), 0); |
f062f41d RDC |
177 | if (nlh == NULL) |
178 | return -EMSGSIZE; | |
179 | ||
180 | rtm = nlmsg_data(nlh); | |
181 | rtm->rtm_family = AF_PHONET; | |
182 | rtm->rtm_dst_len = 6; | |
183 | rtm->rtm_src_len = 0; | |
184 | rtm->rtm_tos = 0; | |
185 | rtm->rtm_table = RT_TABLE_MAIN; | |
186 | rtm->rtm_protocol = RTPROT_STATIC; | |
187 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
188 | rtm->rtm_type = RTN_UNICAST; | |
189 | rtm->rtm_flags = 0; | |
7f116b5b DM |
190 | if (nla_put_u8(skb, RTA_DST, dst) || |
191 | nla_put_u32(skb, RTA_OIF, dev->ifindex)) | |
192 | goto nla_put_failure; | |
f062f41d RDC |
193 | return nlmsg_end(skb, nlh); |
194 | ||
195 | nla_put_failure: | |
196 | nlmsg_cancel(skb, nlh); | |
197 | return -EMSGSIZE; | |
198 | } | |
199 | ||
200 | void rtm_phonet_notify(int event, struct net_device *dev, u8 dst) | |
201 | { | |
202 | struct sk_buff *skb; | |
203 | int err = -ENOBUFS; | |
204 | ||
205 | skb = nlmsg_new(NLMSG_ALIGN(sizeof(struct ifaddrmsg)) + | |
206 | nla_total_size(1) + nla_total_size(4), GFP_KERNEL); | |
207 | if (skb == NULL) | |
208 | goto errout; | |
209 | err = fill_route(skb, dev, dst, 0, 0, event); | |
210 | if (err < 0) { | |
211 | WARN_ON(err == -EMSGSIZE); | |
212 | kfree_skb(skb); | |
213 | goto errout; | |
214 | } | |
215 | rtnl_notify(skb, dev_net(dev), 0, | |
216 | RTNLGRP_PHONET_ROUTE, NULL, GFP_KERNEL); | |
217 | return; | |
218 | errout: | |
4b7673a0 | 219 | rtnl_set_sk_err(dev_net(dev), RTNLGRP_PHONET_ROUTE, err); |
f062f41d RDC |
220 | } |
221 | ||
222 | static const struct nla_policy rtm_phonet_policy[RTA_MAX+1] = { | |
223 | [RTA_DST] = { .type = NLA_U8 }, | |
224 | [RTA_OIF] = { .type = NLA_U32 }, | |
225 | }; | |
226 | ||
661d2967 | 227 | static int route_doit(struct sk_buff *skb, struct nlmsghdr *nlh) |
f062f41d RDC |
228 | { |
229 | struct net *net = sock_net(skb->sk); | |
230 | struct nlattr *tb[RTA_MAX+1]; | |
231 | struct net_device *dev; | |
232 | struct rtmsg *rtm; | |
233 | int err; | |
234 | u8 dst; | |
235 | ||
90f62cf3 | 236 | if (!netlink_capable(skb, CAP_NET_ADMIN)) |
dfc47ef8 EB |
237 | return -EPERM; |
238 | ||
90f62cf3 | 239 | if (!netlink_capable(skb, CAP_SYS_ADMIN)) |
f062f41d RDC |
240 | return -EPERM; |
241 | ||
242 | ASSERT_RTNL(); | |
243 | ||
244 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_phonet_policy); | |
245 | if (err < 0) | |
246 | return err; | |
247 | ||
248 | rtm = nlmsg_data(nlh); | |
249 | if (rtm->rtm_table != RT_TABLE_MAIN || rtm->rtm_type != RTN_UNICAST) | |
250 | return -EINVAL; | |
251 | if (tb[RTA_DST] == NULL || tb[RTA_OIF] == NULL) | |
252 | return -EINVAL; | |
253 | dst = nla_get_u8(tb[RTA_DST]); | |
254 | if (dst & 3) /* Phonet addresses only have 6 high-order bits */ | |
255 | return -EINVAL; | |
256 | ||
257 | dev = __dev_get_by_index(net, nla_get_u32(tb[RTA_OIF])); | |
258 | if (dev == NULL) | |
259 | return -ENODEV; | |
260 | ||
261 | if (nlh->nlmsg_type == RTM_NEWROUTE) | |
262 | err = phonet_route_add(dev, dst); | |
263 | else | |
264 | err = phonet_route_del(dev, dst); | |
265 | if (!err) | |
266 | rtm_phonet_notify(nlh->nlmsg_type, dev, dst); | |
267 | return err; | |
268 | } | |
269 | ||
270 | static int route_dumpit(struct sk_buff *skb, struct netlink_callback *cb) | |
271 | { | |
272 | struct net *net = sock_net(skb->sk); | |
273 | u8 addr, addr_idx = 0, addr_start_idx = cb->args[0]; | |
274 | ||
e67f88dd | 275 | rcu_read_lock(); |
f062f41d RDC |
276 | for (addr = 0; addr < 64; addr++) { |
277 | struct net_device *dev; | |
278 | ||
e67f88dd | 279 | dev = phonet_route_get_rcu(net, addr << 2); |
f062f41d RDC |
280 | if (!dev) |
281 | continue; | |
282 | ||
283 | if (addr_idx++ < addr_start_idx) | |
284 | continue; | |
15e47304 | 285 | if (fill_route(skb, dev, addr << 2, NETLINK_CB(cb->skb).portid, |
f062f41d RDC |
286 | cb->nlh->nlmsg_seq, RTM_NEWROUTE)) |
287 | goto out; | |
288 | } | |
289 | ||
290 | out: | |
e67f88dd | 291 | rcu_read_unlock(); |
f062f41d RDC |
292 | cb->args[0] = addr_idx; |
293 | cb->args[1] = 0; | |
294 | ||
295 | return skb->len; | |
296 | } | |
297 | ||
660f706d | 298 | int __init phonet_netlink_register(void) |
8fb39740 | 299 | { |
c7ac8679 GR |
300 | int err = __rtnl_register(PF_PHONET, RTM_NEWADDR, addr_doit, |
301 | NULL, NULL); | |
660f706d | 302 | if (err) |
303 | return err; | |
304 | ||
305 | /* Further __rtnl_register() cannot fail */ | |
c7ac8679 GR |
306 | __rtnl_register(PF_PHONET, RTM_DELADDR, addr_doit, NULL, NULL); |
307 | __rtnl_register(PF_PHONET, RTM_GETADDR, NULL, getaddr_dumpit, NULL); | |
308 | __rtnl_register(PF_PHONET, RTM_NEWROUTE, route_doit, NULL, NULL); | |
309 | __rtnl_register(PF_PHONET, RTM_DELROUTE, route_doit, NULL, NULL); | |
310 | __rtnl_register(PF_PHONET, RTM_GETROUTE, NULL, route_dumpit, NULL); | |
660f706d | 311 | return 0; |
8fb39740 | 312 | } |